The Andean condor is the world's heaviest soaring bird and can weigh up to 15kg The world's heaviest soaring bird flaps its wings just 1% of the time during flight, researchers have found.

The Andean condor is considered threatened but is in far better shape than its California cousin. Reintroduction programs are working to grow populations of these South American birds.

Earlier this week, a California condor was released again after 22 days of treatment for lead exposure at the Sequoia Park Zoo. A9 is one of only 18 of the free-flying birds on the North Coast.

Gymno comes from the Greek word gymnast, meaning "naked," and refers to the condor's featherless head; gyps is Greek for "vulture." DESCRIPTION: The largest flying land birds in North America, ...

Condor A9 had just been released into the wild this year, in early October. West said they haven’t found an exact source for the lead this time, but they can guess based on the bird’s GPS ...